21604006217627 has 4 divisors (see below), whose sum is σ = 21717116198016. Its totient is φ = 21490896237240.

The previous prime is 21604006217609. The next prime is 21604006217653. The reversal of 21604006217627 is 72671260040612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21604006217627 - 2²² = 21604002023323 is a prime.

It is a super-2 number, since 2×21604006217627² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21604006217527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56554989908 + ... + 56554990289.

It is an arithmetic number, because the mean of its divisors is an integer number (5429279049504).

Almost surely, 2^{21604006217627} is an apocalyptic number.

21604006217627 is a deficient number, since it is larger than the sum of its proper divisors (113109980389).

21604006217627 is a wasteful number, since it uses less digits than its factorization.

21604006217627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113109980388.

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 21604006217627 in words is "twenty-one trillion, six hundred four billion, six million, two hundred seventeen thousand, six hundred twenty-seven".